God — 天主 [hananim]
From a dialectal pronunciation of 하느님 (haneunim, “God”) which became popularized because of a folk etymology connecting it to 하나 (hana), and thus to the Christian concept of monotheism.
In Chinese characters, the word God is written as 天主 and consists of the characters 天(heaven) and 主 (master, king, main), ie "the Lord of Heaven".
Etymology
天 (천) [chon] – heaven, sky;主 (주) [ju] – king, master;
noun (명사), native
Hanja characters: 主，天